//===============================================================================
// Microsoft patterns & practices
// Web Client Software Factory
//===============================================================================
// Copyright � Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===============================================================================
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious.  No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
//===============================================================================

using System;
using System.Diagnostics;
using System.Web;
using Microsoft.Practices.EnterpriseLibrary.ExceptionHandling;
using Microsoft.Practices.CompositeWeb.Utility;

namespace Microsoft.Practices.CompositeWeb.EnterpriseLibrary
{
	/// <summary>
	/// Implamnets a <see cref="IHttpModule"/> for logging exceptions using Enterprise Library.
	/// </summary>
    public class ExceptionLogger : IHttpModule
    {
		/// <summary>
		/// Disposes the object.
		/// </summary>
        public void Dispose()
        {
        }

		/// <summary>
		/// Intializes the module.
		/// </summary>
		/// <param name="context">The application hosting the module.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:ValidateArgumentsOfPublicMethods", Justification = "Validation done by Guard class.")]
        public void Init(HttpApplication context)
        {
            Guard.ArgumentNotNull(context, "context");
            if (!Debugger.IsAttached)
            {
                context.Error += new EventHandler(OnUnhandledException);
            }
        }
		/// <summary>
		/// Handles the <see cref="HttpApplication.Error"/> event, logging the expection using the <see cref="ExceptionPolicy"/>.
		/// </summary>
		/// <param name="sender">The object firing the event.</param>
		/// <param name="e">The event data.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")]
        protected virtual void OnUnhandledException(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            Exception ex = application.Server.GetLastError().GetBaseException();
            ExceptionPolicy.HandleException(ex, "GlobalExceptionLogger");
        }
    }
}
